BSNL Leased Line Internet Service

Leased LineInternet Service

The National Internet Backbone is the national broad based access
network to provide nodes for Internet access through out the country. The
objective of the backbone is to build a country wide network to provide
convenient & easily accessible Internet Access points ( IAPs) for BSNL
Internet Service Providers (ISP) as well as private ISPs so that they can
connect their point of presence (POP) to the Internet quickly Presently 549 IAP
stations are to be connected across the country.

Network Architecture :-

The NIB consists of a multi-tier structure of aggregation & connectivity
at three different levels.

The first tier consists of metropolitan & major cities ( Type A)
connected by high capacity links to gateways. Around 14 cities have been
recognized as Type A. Six cities with International gateway & rest eight
cities without International gateway.
The second tier (B) consists of 31 medium sized towns which are connected
with first tier by medium capacity links.
A total 376 district headquarters including small towns comprise the third
tier ( Type C) & are planned to be connected to the second tier to the
network in the final stage. Type C locations have been further segregated into
CI- 41 , CII- 87 cities & rest CIII.

Link between Major Stations

The network architecture for these stations is with �Mesh Topology�
connecting the core A1 stations The core backbone is of 8 Mbps that can be
upgraded to E3 or STM-1 Each of the A2 station will be connected to two A1
stations with 2 Mbps links to E3. Each B station is to connected to two A1 or A2
stations with 2 Mbps links. The type C station will be connected to A1/A2 or B
station.